BACKGROUND OF THE INVENTION
Field of the Invention
[0001] This invention relates to a cargo handling pump for transferring the liquid contained
in a tank of a vessel or the like.
Description of the Related Art
[0002] Document US-A-5 336 064 describes an electric motor driven pump including an electric
motor having a housing, energizing means surrounded by the housing and a rotatable
output shaft extending from the housing. The pump further includes an impeller connected
to the output shaft and an outer shell surrounding the electric motor.
[0003] Further Fig. 6 is a longitudinal sectional view showing a conventional cargo handling
pump for transferring a liquid cargo loaded in a vessel tank T.
[0004] This cargo handling pump A includes an electric motor 1 disposed above the tank T,
a pump 2 disposed at the bottom of the tank T, and a plurality of intermediate shafts
3 which connect the electric motor 1 and the pump 2.
[0005] The electric motor 1 is mounted on a motor mount 4 which is detachably fitted on
the top surface of the tank T. Couplings 5 and intermediate shafts 3 are alternately
connected to the output shaft la of the electric motor 1. Protective pipes 6 and bearings
7 are alternately fitted to the underside of the motor mount 4. A centrifugal pump
2 has an end surface thereof fixed to the lowermost protective pipe 6.
[0006] The first intermediate shaft 3, the one connected to the output shaft la, is supported
by a bearing 8 provided in the motor mount 4, while the other intermediate shafts
3 are supported by bearings 7. The lowermost intermediate shaft 3 is connected to
the rotary shaft 9 of the centrifugal pump 2, and a discharge pipe 10 connected to
the centrifugal pump 2 extends through the top surface of the tank T and opens to
the outside. The bearings 7 are arranged such that the intermediate shafts 3 are aligned
with each other in a straight line.
[0007] If the electric motor 1, after fitting of the thus constructed cargo handling pump
A to the tank T, is rotated, an impeller 11 fixed around the rotary shaft 9 is rotated
to suck in ambient liquid from the suction side 12 of the centrifugal pump 2 and transfer
same via the discharge pipe 10 to the outside of the tank T.
[0008] In this case, however, since the tank T has a large size, the entire length of the
intermediate shafts 3 between the electric motor 1 and the centrifugal pump 2 is prolonged,
thereby requiring an increased number of bearings 7 for supporting the intermediate
shafts 3. Thus, a problem arises that the cargo handling pump A requires a large number
of parts and its overall weight is increased. Further, due to the structure in which
each intermediate shaft 3 is enclosed in the protective pipe 6, it is difficult to
perform fine adjustment for centering and aligning the intermediate shafts 3.
[0009] Consequently, in case the intermediate shafts 3 are not co-axial, unwanted vibrations
are apt to be caused, leading to damage to bearings 7 and to possible trouble during
operation of the cargo handling pump. Under these circumstances, a cargo handling
pump A1 of the hydraulically driven type as shown below is conventionally used.
[0010] The cargo handling pump A1, as shown in its longitudinal sectional view in Fig. 7,
comprises a flange 13 fitted to the top surface of the tank T, a protective pipe 14
which is at the upper end fixed to the flange 13 and at the lower end connected with
a motor cover 15 in a watertight manner, and a centrifugal pump 2 fixed at the upper
end to the motor cover 15. An air chamber 16 is formed inside the protective pipe
14 and the motor cover 15, which air chamber is sealed against the liquid in the tank
T. A hydraulic motor 17 is mounted on the upper end surface of the centrifugal pump
2 inside the motor cover 15 so that the rotary shaft 9 of the latter is connected
to the output shaft of the hydraulic motor 17.
[0011] On the flange 13 is fixed a hydraulic head 18 where hydraulic pipeways are collected.
An oil pipe extending from a hydraulic unit (not shown) located outside the tank T
and functioning as a hydraulic source is connected to the hydraulic head 18, which
hydraulic head is connected through a hydraulic pipe 19 to the hydraulic motor 17.
[0012] A branch pipe 20 extends from the hydraulic motor 17 to a bearing 21 for the rotary
shaft 9 and to a shaft seal packing 22. The oil having been used to lubricate the
bearing 21 is fed through an oil return pipe 23 to the hydraulic head 18. The oil
having leaked from the shaft seal packing 22 is contained in a drain receiver 24 provided
in the centrifugal pump 2. Air pressure from a pressure source (not shown) located
outside is supplied through the protective pipe 14 to the air chamber 16, and from
there further to the drain receiver 24 to take the oil in the drain receiver 24 along
therewith through an air return pipe 25 to the outside of the tank T.
[0013] If hydraulic pressure is supplied from the hydraulic unit through the hydraulic head
18 to the hydraulic motor 17, the hydraulic motor 17 and thus the rotary shaft 9 are
rotated to suck in the liquid from the suction side 12 of the centrifugal pump 2 and
discharge same through a discharge pipe 10 to the outside of the tank T.
[0014] The cargo handling pump A1 as described above is advantageous in that, since no such
intermediate shafts 3 as shown in Fig. 6 are used, no vibrations are caused, and that
damage to such bearings as 7 and 8 in Fig. 6 can be neglected. The cargo handling
pump A1, however, still has drawbacks such as those mentioned below.
(1) The hydraulic unit produces loud noises during its operation which are almost
intolerable to inboard residents as well as workers inside and outside the vessel,
and has been required to be improved in this respect.
(2) The mechanical efficiency of the hydraulic unit is very low, leading to the loss
of lots of energy.
(3) The piping of the high pressure oil and the installation of the hydraulic pressure
control equipment are complicated.
(4) The hydraulic motor has an upper limit in the number of revolutions, resulting
in the discharge lift of the cargo handling pump limited. For a greater lift a costly
two-stage impeller structure must be provided.
SUMMARY OF THE INVENTION
[0015] This invention has been accomplished to overcome the above drawbacks and an object
of this invention is to provide a cargo handling pump which does not cause unwanted
vibrations and is free from damage to bearings, which has a high mechanical efficiency,
which does not cause loud noises, and which can be continuously operated for a long
period of time.
[0016] In order to attain the object, an electrically-powered water-immersed pump of this
invention comprises: a pressure-resistant explosion-proof electric motor enlcosed
by a double casing comprised of inner and outer cases with a motor-cooling oil passage
formed therebetween, the outer case being at upper and lower ends closed in a watertight
manner respectively by upper and lower lids between which an output shaft of the electric
motor is rotatably held; a flange detachably fitted to a top surface of a tank containing
a liquid to be transferred; a downwardly-extending pipe which is at an upper end fixed
to the flange and at a lower end connected through a terminal box to the electric
motor; a pump with a casing which is at an end surface fixed to an underside of the
electric motor and with a rotary shaft which is connected to the output shaft of the
electric motor; a cylindrically-shaped motor cover immersed in the liquid in the tank
and accommodating therein the electric motor and the terminal box in a watertight
manner; a protective pipe extending from the flange to an upper end of the motor cover
and accommodating therein the downwardly-extending pipe in a watertight manner; a
cooling-oil inlet pipe which communicates from a cooling-oil delivering pump located
outside the tank through the flange to the motor-cooling oil passage inside the double
casing of the electric motor; a cooling-oil outlet pipe which extends from the motor-cooling
oil passage through the flange to open to the outside of the tank; and an electric
cable which extends from a power source located outside the tank through the flange
and the terminal box to the electric motor.
[0017] The outer peripheral surface of the inner case of the electric motor may be provided
with spiral ribs to form the motor-cooling oil passage.
[0018] A lubricating oil passage may further be provided so as to extend from the cooling-oil
inlet pipe for lubricating a bearing for the rotary shaft of the pump.
[0019] The electrically-powered water-immersed pump of this invention may further comprises
a packing case which encloses therein a shaft seal packing portion for the rotary
shaft of the pump in a watertight manner; a branch pipe extending from the cooling-oil
inlet pipe to the shaft seal packing portion; a drain pipe communicating from the
packing case to the outside of the tank; and an air pressure passage provided to communicate
from outside the tank through the motor cover to the packing case, whereby the drain
of the cooling oil leaked from the shaft seal packing portion is discharged by the
air pressure through the drain pipe.
[0020] The rotary shaft of the pump may be mechanically integrally connected to an end of
the output shaft of the electric motor.
[0021] Alternatively, the end surfaces of the rotary shaft of the pump and of the output
shaft of the electric motor, which are of different materials, may be subjected to
welding to be joined together.
[0022] The protective pipe, the motor cover and the centrifugal pump of the thus constructed
electrically-powered water-immersed pump are supported-in the tank when the flange
is fitted to the top surface of the tank.
[0023] A water-tight air chamber is formed inside the protective pipe and the motor cover,
in which air chamber the downwardly-extending pipe, the terminal box and the pressure-resistant
explosion-proof electric motor are accommodated.
[0024] The electric motor is enclosed by a casing of double structure in which the motor-cooling
oil passage is formed, thereby effectively insulating the running sound of the electric
motor.
[0025] By operating the electric motor, the cargo-handling centrifugal pump is rotated,
thereby to transfer the liquid through a discharge pipe to the outside of the tank.
[0026] The cooling oil delivering pump located outside the tank supplies the cooling oil
through the cooling oil inlet pipe to the motor-cooling oil passage. The cooling oil
then flows along the spiral ribs to remove the heat generated from the electric motor.
[0027] Part of the cooling oil is passed through the lubricating oil passage to lubricate
the bearing for the rotary shaft of the pump.
[0028] The cooling oil supplied from the cooling-oil inlet pipe through the branch pipe
to the shaft seal packing portion returns to the spirals inside the double casing
of the electric motor after lubricating the shaft seal packing portion.
[0029] Thus, the oil supplied from the cooling-oil delivering pump performs three functions,
i.e., cooling of the electric motor, lubricating of the bearing for the rotary shaft
of the pump, and lubricating and cooling of the shaft seal packing.
[0030] Since the electric motor is maintained at below a certain temperature, same can be
operated for a long period of time.
[0031] Since the output shaft of the electric motor and the shaft of the pump are subjected
to mechanical connection or pressure welding to be integrally joined together, an
error in the concentricity of the shafts is unlikely to take place.
[0032] The above and other objects, features and advantages of this invention will become
apparent from the following description and the appended claims, taken in conjunction
with the accompanying drawings in which like parts or elements are denoted by like
reference characters.
BRIEF DESCRIPTION OF THE DRAWINGS
[0033]
Fig. 1 is a longitudinal sectional view of an electrically-powered water-immersed
pump according to one embodiment of this invention;
Fig. 2 is an enlarged view of a portion including an electric motor in Fig. 1;
Fig. 3 is an enlarged view of a portion including a centrifugal pump in Fig. 1;
Fig. 4 is a front view of a terminal box and the electric motor;
Fig. 5 is a longitudinal sectional view of an essential portion of an electrically-powered
water-immersed pump according to another embodiment of this invention;
Fig. 6 is a longitudinal sectional view of a conventional electrically-driven cargo
handling pump; and
Fig. 7 is a longitudinal sectional view of a conventional hydraulically-driven cargo
handling pump.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0034] Embodiments of this invention will now be described with reference to the attached
drawings.
[0035] Referring to Figs. 1 to 3, a flange 26 is detachably fitted to the top surface of
a tank T, and a pipe- and wire-connection unit 27 is securely mounted thereon. Upper
ends of a downwardly-extending pipe 28, a cooling-oil outlet pipe 29 and a cooling-oil
inlet pipe 52a are inserted through the flange 26 to be fixed.
[0036] The downwardly-extending pipe 28 has its lower end connected to a terminal box 30
and sealed by a pipe seal member 31 fixed at an upper end of the terminal box 30 (Figs.
1 and 2).
[0037] The terminal box 30 comprises a base plate 32, side walls 33 standing upright thereon,
and an upper wall 34 provided on the upper ends of the side walls 33. A terminal mount
36 is fitted to a support 35 which protrudes from an inner surface of one of the side
walls 33. Another side wall 33 is provided with an opening for allowing a wire-connecting
operation at the terminal mount 36 to be performed, which opening is normally closed
by a terminal-box cover 37 screwed to the side wall 33 (Figs. 2 and 4).
[0038] An electric wire 38 extending from a power source (not shown) on the top surface
of the tank T is passed through the pipe- and wire-connection unit 27 and then through
the downwardly-extending pipe 28 to be connected to the terminal mount 36 (Figs. 1
and 2).
[0039] An upper lid 39 of a pressure-resistant explosion-proof electric motor 44 is screwed
to the underside of the base plate 32 of the terminal box 30, which upper lid is at
the underside provided with annular grooves 40 and 41 for fitting respective O-rings
42 and 43 therein. An inner case 44a of the pressure-resistant explosion-proof electric
motor 44 is disposed such that its upper end pressure-contacts the O-ring 42, while
an outer case 45 of the electric motor 44--which is at the upper and lower ends provided
with respective flange portions 45a and 45b--has its flange portion 45a pressure-contacted
with the O-ring 43 (Fig. 2).
[0040] Spiral ribs 46 are provided on an outer peripheral surface of the inner case 44a
of the electric motor 44, with which spiral ribs is contacted an inner peripheral
surface of the outer case 45 to provide a double casing and a motor-cooling oil passage
54 inside the double casing (Fig. 2).
[0041] The cooling-oil inlet pipe 52a (Fig. 1) is connected to a cooling-oil inlet 52 (Fig.
2) provided in a lower lid 47 of the electric motor 44, which cooling-oil inlet communicates
through an annular passage 53, an oil passage 55 and an upwardly-directed oil passage
56 to a lower end portion of the motor-cooling oil passage 54.
[0042] An upper end portion of the motor-cooling oil passage 54 communicates via an oil
passage 57 provided in the flange portion 45a of the outer case 45 to an oil passage
58 in the upper lid 39, which oil passage 58 communicates to the cooling-oil outlet
pipe 29 which connects to a cooling-oil outlet 58a (Figs. 1 and 2).
[0043] A stator 59 is provided inside the inner case 44a of the electric motor 44, and a
rotor 61 fixed around the output shaft 60 of the electric motor 44 is disposed inside
the stator 59.
[0044] An electric wire 62 extends from the stator 59 to be electrically connected with
the electric wire cable 38 at the terminal mount 36.
[0045] A bearing 63 is provided at the upper lid 39 of the electric motor 44 for supporting
the output shaft 60 at the upper end, and a bearing 64 is provided along with a shaft
seal packing 65 at the lower lid 47 for supporting the output shaft 60 at a lower
portion (Fig. 2). The lower end of the output shaft 60 is machined into a male spline
66.
[0046] A facing flange 68 of an centrifugal pump 67 is joined to the underside of the lower
lid 47 of the electric motor 44, and the joint is made watertight by means of an O―ring
or the like (Fig. 3).
[0047] A cylindrically-shaped motor cover 69 is provided around the electric motor 44 such
that its lower end surface contacts the facing flange 68 of the centrifugal pump 67
in a watertight manner.
[0048] An upper cover 70 is fixed to the upper end of the motor cover 69, which upper cover
is provided with a hole in which the lower end portion of a protective pipe 71 is
fitted (Fig. 1). The protective pipe 71 is at the upper end fixed to the flange 26.
[0049] Thus, an air chamber 72 is formed inside the protective pipe 71 and the motor cover
69, which air chamber accommodates therein the downwardly-extending pipe 28, terminal
box 30 and pressure-resistant explosion-proof electric motor 44 in a watertight manner.
[0050] A bearing case 73 is fitted to the facing flange 68, and the joint is made watertight
by an O-ring. The rotary shaft 76 of the centrifugal pump 67 is supported by an upper
bearing 74 and a lower bearing 75 each provided at the bearing case 73 (Fig. 3).
[0051] A cover case 77 is provided outside the bearing case 73 to cover same, and a pump
case 78 is fixed to the lower end of the bearing case 73.
[0052] The pump case 78 is provided with a suction port 12 for sucking in liquid and with
a discharge port 80 for discharging the liquid, to which discharge port is connected
a discharge pipe 81 for discharging the liquid outside the tank T (Fig. 3).
[0053] The rotary shaft 76 is at the upper end provided with a female spline 76a for engagement
with the male spline 66 of the output shaft 60 and at the lower end provided with
impeller 82.
[0054] A packing case 83 is provided which is fixed to the bearing case 73 inside the pump
case 78.
[0055] A hermetically sealed air chamber 88 is formed inside the packing case 83, in the
interior of which air chamber a shaft seal packing portion 84 is provided for sealing
the rotary shaft 76 (Fig. 3).
[0056] A bearing-lubricating oil passage is made up of a branch pipe 85 communicating from
the annular passage 53 of the lower lid 47 to the lower bearing 75 of the bearing
case 73, a lubricating oil passage 86 communicating from the lower bearing 75 to the
upper bearing 74, and a cooling oil passage 87 communicating from the upper bearing
74 to the annular passage 53 (Fig. 3).
[0057] The operation of the thus constructed electrically-powered water-immersed pump B
will now be described.
[0058] The flange 26 of the electrically-powered water-immersed pump B is fitted to the
top surface of the tank T so that the protective pipe 71, motor cover 69 and centrifugal
pump 67 extend into the tank, followed by the mounting of a power source, a cooling
oil delivering pump and an air pressure source on the top surface of the tank T.
[0059] A watertight air chamber 72 is continuously formed inside the protective pipe 71
and the motor cover 69, and the downwardly-extending pipe 28, terminal box 30 and
pressure-resistant explosion-proof electric motor 44 contained in the air chamber
72 are protected from the ambient liquid.
[0060] Owing to the non-presence of intermediate shafts and their supporting bearings as
in the prior art, the electrically-powered water-immersed pump B is relatively light
in weight.
[0061] Since the electric motor 44 is enclosed by a double casing made up of the inner and
outer cases 44a and 45, the running sound of the electric motor is effectively insulated.
[0062] The spiral motor-cooling oil passage 54 formed by the ribs 46 in the double casing
serves to increase the cooling effect by the cooling oil.
[0063] By operating the electric motor 44, the centrifugal pump 67 is rotated. If the pump
67 is rotated, the liquid in the tank T is discharged through the discharge port 80
of the centrifugal pump 67 and the discharge pipe 81 to the outside of the tank T.
[0064] The cooling oil delivering pump disposed outside the tank T supplies the cooling
oil through the cooling oil inlet pipe 52a to the motor-cooling oil passage 54, where
the cooling oil flows along the spiral ribs 46 to efficiently remove the heat generated
from the electric motor 44. Consequently, the electrically-powered water-immersed
pump B can be operated for a long period of time.
[0065] Referring to Fig. 5, if the output shaft 60 of the electric motor 44 is extended
to include the rotary shaft 76 of the pump 67 as an integral part thereof, the bearing
case 73 and the bearings 74 and 75 as shown in Fig. 3 can be omitted. Further, an
error in the concentricity of the shafts can be prevented.
[0066] The output shaft 60 of the electric motor 44 is generally made of carbon steal, while
it is required that the rotary shaft 76 of the pump 67 is made of stainless steal.
[0067] Thus, if the output shaft 60 of the electric motor 44 and the rotary shaft 76 of
the pump 67 are to be integrally united as shown in Fig. 5, the ends of both shafts
are subjected to pressure welding or welding to be joined together.
[0068] The joint of both shafts as referred to above is located upwardly of a shaft seal
92 for sealing the output shaft 60 against the cooling oil, or at an intermediate
position between the shaft seal 92 and an upper portion 84a of a shaft seal packing
portion 84.
[0069] With the construction as described hereinabove, the following advantages can be obtained.
(1) A solution has been given to the drawbacks to the conventional electric motor-driven
pump such as the increase in the overall weight, the generation of vibrations and
the damage to the bearings and the like.
(2) A solution has been given to the drawbacks to the conventional hydraulic motor-driven
pump such as the generation of noises, the low mechanical efficiency and the like.
(3) Since the electrically-powered water-immersed pump of this invention is small
in size and of simple structure, its maintenance, disassembly and assembly as well
as its transportation and installation can be easily done.
The pump of this invention has an advantage that its mechanical efficiency during
operation is higher than that of the hydraulic motor-driven pump.
(4) Since in the electrically-driven water-immersed pump of this invention the pressure-resistant
explosion-proof electric motor is enclosed by a casing of double structure having
the cooling oil passage formed therein, there are obtained advantages that the running
sound of the electric motor is less noisy and that, since a rise in temperature is
suppressed, a long period of no-open operation of the pump is possible.
1. An electrically-powered water-immersed pump (B) comprising:
a pressure-resistant explosion-proof electric motor (44) enclosed by a double casing
comprised of inner and outer cases (44a ; 45) with a motor-cooling oil passage (54)
formed therebetween, said outer case (45) being at upper and lower ends closed in
a watertight manner respectively by upper and lower lids (39 ; 47) between which an
output shaft (60) of said electric motor (44) is rotatably held;
a flange (26) detachably fitted to a top surface of a tank (T) containing a liquid
to be transferred;
a downwardly-extending pipe (28) which is at an upper end fixed to said flange (26)
and at a lower end connected through a terminal box (30) to said electric motor (44);
a pump (67) with a casing which is at an end surface fixed to an underside of said
electric motor (44) and with a rotary shaft (76) which is connected to said output
shaft (60) of said electric motor (44);
a cylindrically-shaped motor cover (69) immersed in the liquid in the tank (T) and
accommodating therein said electric motor (44) and said terminal box (30) in a watertight
manner;
a protective pipe (71) extending from the flange (26) to an upper end of said motor
cover and accommodating therein said downwardly-extending pipe (28) in a watertight
manner;
a cooling-oil inlet pipe (52a) which communicates from a cooling-oil delivering pump
located outside the tank (T) through said flange (26) to said motor-cooling oil passage
(54) inside said double casing of said electric motor (44);
a cooling-oil outlet pipe (29) which extends from said motor-cooling oil passage (54)
through said flange (26) to open to the outside of the tank (T); and
an electric cable (38) which extends from a power source located outside the tank
(T) through said flange (26) and said terminal box (30) to said electric motor (44).
2. An electrically-powered water-immersed pump (B) according to claim 1, wherein spiral
ribs (46) are provided on an outer peripheral surface of said inner case (44a) to
form said motor-cooling oil passage (54).
3. An electrically-powered water-immersed pump (B) according to claim 1 or 2, further
comprising a lubricating oil passage (86) extending from said cooling-oil inlet pipe
(52a) for lubricating a bearing for said rotary shaft (76) of said pump.
4. An electrically-powered water-immersed pump (B) according to any one of claims 1 to
3, further comprising a packing case (83) which encloses therein a shaft seal packing
portion (84) for said rotary shaft (76) of said pump (67) in a watertight manner;
a branch pipe (85) extending from said cooling-oil inlet pipe (52a) to said shaft
seal packing portion (84); a drain pipe communicating from said packing case (83)
to the outside of the tank (T); and an air pressure passage provided to communicate
from outside the tank (T) through said motor cover (69) to the packing case (83),
whereby the drain of the cooling oil leaked from said shaft seal packing portion (84)
is discharged by the air pressure through said drain pipe.
5. An electrically-powered water-immersed pump (B) according to any one of claims 1 to
4, wherein said rotary shaft (76) of said pump (67) is mechanically integrally connected
to an end of said output shaft (60) of said electric motor (44).
6. An electrically-powered water-immersed pump (B) according to any one of claims 1 to
4, wherein end surfaces of said rotary shaft (76) of said pump (67) and of said output
shaft (60) of said electric motor (44), which are made of different materials, are
subjected to welding to be joined together.
1. Elektrisch angetriebene Unterwasserpumpe (B), mit
einem druckfesten explosionssicheren Elektromotor (44), der von einem Doppelgehäuse
umschlossen ist, das aus einem inneren und einem äußeren Gehäuse (44a; 45) mit einem
dazwischen gebildeten Motorkühlölkanal (44) besteht, wobei das Außengehäuse (45) an
dem oberen und dem unteren Ende jeweils wasserdicht durch einen oberen und einen unteren
Deckel (39; 47) geschlossen ist, zwischen denen eine Abtriebswelle (60) des elektrischen
Motors (44) drehbar gehalten ist;
einem Flansch (26), der abnehmbar an einer oberseitigen Fläche eines eine zu übertragende
Flüssigkeit enthaltenden Tanks (T) befestigt ist;
einem sich nach unten erstreckenden Rohr (28), das an einem oberen Ende an dem Flansch
(26) befestigt und an einem unteren Ende durch eine Anschlussbox (30) mit dem elektrischen
Motor (44) verbunden ist;
einer Pumpe (67) mit einem Gehäuse, das an einer Endfläche an einer Unterseite des
elektrischen Motors (44) befestigt ist, und eine Drehwelle (76) aufweist, die mit
der Abtriebswelle (60) des elektrischen Motors (44) verbunden ist;
einem zylindrisch geformten Motordeckel (69), der in die Flüssigkeit in dem Tank eingetaucht
ist und in dem der elektrische Motor (44) und die Anschlussbox (30) wasserdicht untergebracht
sind;
einem Schutzrohr (71), das sich von dem Flansch (26) zu einem oberen Ende des Motordeckels
erstreckt und in dem wasserdicht ein sich nach unten erstreckendes Rohr (28) untergebracht
ist;
einem Kühlöleinlassrohr (52a), das eine Verbindung von einer Kühlöl liefernden Pumpe,
die außerhalb des Tanks (T) angeordnet ist, durch den Flansch (26) zu dem Motorkühlölkanal
(54) im Innern des Doppelgehäuses des elektrischen Motors (44) herstellt;
einem Kühlölauslassrohr (29), das sich von dem Motorkühlölkanal (54) durch den Flansch
(26) erstreckt und sich zur Außenseite des Tanks (T) öffnet; und mit
einem elektrischen Kabel (38), das sich von einer außerhalb des Tanks (T) angeordneten
Stromquelle durch den Flansch (26) und die Anschlussbox (30) zu dem elektrischen Motor
(44) erstreckt.
2. Elektrisch angetriebene Unterwasserpumpe (B) nach Anspruch 1, bei der auf einer Außenumfangsfläche
des inneren Gehäuses (44) spiralförmige Rippen (46) zur Bildung des Motorkühlölkanals
(44) vorgesehen sind.
3. Elektrisch angetriebene Unterwasserpumpe (B) nach Anspruch 1 oder 2, weiterhin mit
einem Schmierölkanal (86), der sich von dem Kühlöleinlassrohr (52a) zur Schmierung
eines Lagers für die Drehwelle (76) der Pumpe erstreckt.
4. Elektrisch angetriebene Unterwasserpumpe (B) nach einem der Ansprüche 1 bis 3, weiterhin
mit einem Abdichtgehäuse (89), in dem ein Wellendichtungs-Packungsabschnitt (84) für
die Drehwelle (76) der Pumpe (67) wasserdicht eingeschlossen ist; einem Abzweigrohr
(85), das sich von dem Kühlöleinlassrohr (52a) zu dem Wellendichtungs-Packungsabschnitt
(84) erstreckt; einem Drainagerohr, das das Pakkungsgehäuse (83) mit der Außenseite
des Tanks (T) verbindet; und mit einem Luftdruckkanal, der für eine Verbindung von
der Außenseite des Tanks (T) durch den Motordeckel (29) zu dem Packungsgehäuse (83)
vorgesehen ist, wobei die Drainage des aus dem Wellendichtungs-Packungsabschnitt (84)
leckenden Kühlöls mittels des Luftdrucks durch das Drainagerohr ausstoßbar ist.
5. Elektrisch angetriebene Unterwasserpumpe (B) nach einem der Ansprüche 1 bis 4, bei
der die Drehwelle (76) der Pumpe (67) mechanisch einstückig mit einem Ende der Abtriebswelle
(60) des elektrischen Motors (44) verbunden ist.
6. Elektrisch angetriebene Unterwasserpumpe (B) nach einem der Ansprüche 1 bis 4, bei
der Endflächen der Drehwelle (76) der Pumpe (67) und die Abtriebswelle (60) des elektrischen
Motors (44), die aus unterschiedlichen Materialien bestehen, zur gemeinsamen Verbindung
verschweißt sind.
1. Pompe à entraînement électrique immergée dans l'eau (B), comprenant :
un moteur électrique anti-explosion résistant à la pression (44) enserré par un double
bottier constitué de gaînes intérieure et extérieure (44a, 45) avec un passage (54)
d'huile de refroidissement du moteur formé entre elles, ladite gaîne extérieure (45)
étant, aux extrémités supérieure et inférieure, fermée de manière étanche à l'eau,
respectivement, par des couvercles supérieur et inférieur (39; 47) entre lesquels
un arbre de sortie (60) dudit moteur électrique (44) est monté à rotation;
une bride (26) ajustée de manière amovible sur une surface supérieure d'un réservoir
(T) contenant un liquide à transférer;
un tube descendant (28) qui est fixé, à une extrémité supérieure, à ladite bride (26)
et connecté, à une extrémité inférieure, audit moteur électrique (44) via une boîte
terminale (30) ;
une pompe (67) avec un boîtier qui est fixé, sur une surface d'extrémité, à la partie
inférieure dudit moteur électrique (44) et avec un arbre rotatif (76) qui est raccordé
audit arbre de sortie (60) dudit moteur électrique (44) ;
un capot de moteur de forme cylindrique (69) immergé dans le liquide du réservoir
(T) et y recevant ledit moteur électrique (44) et ladite boîte terminale (30) de manière
étanche à l'eau;
un tube protecteur (71) s'étendant de la bride (26) à une extrémité supérieure dudit
capot de moteur et y recevant ledit tube descendant (28) de manière étanche à l'eau;
un tube d'entrée d'huile de refroidissement (52a) qui établit une communication entre
la pompe de délivrance d'huile de refroidissement située à l'extérieur du réservoir
(T), via ladite bride (26), et ledit passage (54) d'huile de refroidissement du moteur
à l'intérieur dudit double boîtier dudit moteur électrique (44);
un tube de sortie d'huile de refroidissement (29) qui s'étend dudit passage (54) d'huile
de refroidissement du moteur via ladite bride (26) pour déboucher sur l'extérieur
du réservoir (T); et
un câble électrique (38) qui s'étend d'une source d'énergie située à l'extérieur du
réservoir (T) via ladite bride (26) et ladite boîte terminale (30) jusqu'audit moteur
électrique (44).
2. Pompe à entraînement électrique immergé dans l'eau (B) selon la revendication 1, dans
laquelle des nervures spiralées (46) sont formées sur une surface périphérique extérieure
dudit boîtier intérieur (44a) pour former ledit passage (54) d'huile de refroidissement
du moteur.
3. Pompe à entraînement électrique immergé dans l'eau (B) selon la revendication 1 ou
2, comprenant par ailleurs un passage d'huile lubrifiante (86) s'étendant depuis ledit
tube d'entrée d'huile de refroidissement (52a) pour lubrifier un palier pour ledit
arbre rotatif (76) de ladite pompe.
4. Pompe à entraînement électrique immergé dans l'eau (B) selon l'une quelconque des
revendications 1 à 3, comprenant par ailleurs une boîte à garniture (83) qui renferme
une partie de garniture étanche (84) pour ledit arbre rotatif (76) de ladite pompe
(67) de manière étanche à l'eau; un tube de dérivation (85) s'étendant dudit tube
d'entrée d'huile de refroidissement (52a) à ladite partie de garniture étanche (84)
de l'arbre; un tube de décharge établissant une communication entre ladite boîte de
garniture (83) et l'extérieur du réservoir (T); et un passage de pression d'air prévu
pour établir une communication entre l'extérieur du réservoir (T), via ledit capot
de moteur (69), et ladite boîte de garniture (83), de telle sorte que la décharge
de l'huile de refroidissement qui s'échappe de ladite partie de garniture étanche
(84) de l'arbre soit refoulée par la pression de l'air à travers ledit tube de décharge.
5. Pompe à entraînement électrique immergée dans l'eau (B) selon l'une quelconque des
revendications 1 à 4, dans laquelle ledit arbre rotatif (76) de ladite pompe (67)
est raccordé mécaniquement d'une seule pièce avec une extrémité dudit arbre de sortie
(60) dudit moteur électrique (44).
6. Pompe à entraînement électrique immergée dans l'eau (B) selon l'une quelconque des
revendications 1 à 4, dans laquelle des surfaces d'extrémité dudit arbre rotatif (76)
de ladite pompe (67) et dudit arbre de sortie (60) dudit moteur électrique (44), qui
sont formées de différents matériaux, sont soumises à un soudage pour être jointes
ensemble.